RXSA-2026:25121: kernel security update

RXSA-2026:25121, released June 15, 2026, fixes 13 CVEs in kernel (version 0:4.18.0-553.132.1.el8_10.cloud.0.1). None of them is reported as exploited. Patch Radar priority: Urgent.

Urgent

CVEs closed

1 rated Critical

Exploited

None reported

Highest CVSS

9.8

Base score, 0 to 10

Highest EPSS

0.0069

52nd percentile

Priority of the 13 CVEs

Patch now 0
                                Urgent 1
                                High 12
                                Routine 0

Fixed package versions

Product	Release	Fixed in
kernel	rocky 8	0:4.18.0-553.132.1.el8_10.cloud.0.1

CVEs this fix closes

Priority	CVE	Title	CVSS	EPSS	Exploitation
Urgent	CVE-2025-68366	linux: In the Linux kernel, the following vulnerability has been resolved: nbd: defer config unlock in nbd_genl_connect Th...	8.8	0.0020	None reported
High	CVE-2026-43037	ip6_tunnel: clear skb2->cb[] in ip4ip6_err()	9.8	0.0069	None reported
High	CVE-2026-43125	dlm: validate length in dlm_search_rsb_tree	9.8	0.0054	None reported
High	CVE-2026-22984	kernel: In the Linux kernel, the following vulnerability has been resolved: libceph: prevent potential out-of-bounds reads in...	8.8	0.0041	None reported
High	CVE-2026-22990	kernel: In the Linux kernel, the following vulnerability has been resolved: libceph: replace overzealous BUG_ON in osdmap_app...	8.8	0.0040	None reported
High	CVE-2026-31613	smb: client: fix OOB reads parsing symlink error response	8.8	0.0039	None reported
High	CVE-2026-43038	kpatch-patch-4_18_0-553_109_1: This is a kernel live patch module which can be loaded by the kpatch command line utility to modify the code of a run...	9.8	0.0026	None reported
High	CVE-2025-21858	kernel-64kb: The SUSE Linux Enterprise 15 SP7 kernel was updated to receive various security bugfixes. The following security bu...	8.8	0.0025	None reported
High	CVE-2026-45852	kernel-uek-modules: [5.15.0-323.211.3.3] - Revert 'x86/alternatives: Add alt_instr.flags' (Harshit Mogalapalli) [Orabug: 39853924] [5.1...	8.8	0.0020	None reported
High	CVE-2026-23392	netfilter: nf_tables: release flowtable after rcu grace period on error	8.8	0.0017	None reported
High	CVE-2023-53781	linux: In the Linux kernel, the following vulnerability has been resolved: smc: Fix use-after-free in tcp_write_timer_handl...	8.8	0.0015	None reported
High	CVE-2026-46181	RDMA/mlx4: Fix mis-use of RCU in mlx4_srq_event()	8.8	0.0014	None reported
High	CVE-2026-31581	ALSA: 6fire: fix use-after-free on disconnect	8.8	0.0013	None reported

Also fixes CVE-2025-68366

ELSA-2026-50112
kernel-uek, kernel-uek-core, kernel-uek-debug and 32 more on ol 10, ol 9
ELSA-2026-21556
kernel, kernel-abi-stablelists, kernel-core and 26 more on ol 9
RHSA-2026:21556
kernel, kernel-64k, kernel-64k-core and 69 more on RHEL 9
ALSA-2026:21556
kernel, kernel-64k, kernel-64k-core and 71 more on almalinux 9
RLSA-2026:21556
kernel on rocky 9
ELSA-2026-50145
bpftool, kernel-uek, kernel-uek-container and 16 more on ol 8, ol 9
OPENSUSE-SU-2026:20287-1
dtb-aarch64, kernel-64kb, kernel-azure and 10 more on opensuse-leap 16.0
SUSE-SU-2026:20599-1
kernel-64kb, kernel-azure, kernel-default and 7 more on sles 16.0

Vendor advisory

https://errata.rockylinux.org/RXSA-2026:25121

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